Helicopter device



June 4, 1929. H, P|TCA1RN L'EZ? HELICOPTER DEVICE Filed Deo. 12, 1925 +Mw A TTORNE Y6' to revolve the wings.

Patented June 4, .1929.

UNITED; STATES PATENT oFFicE.

HAROLD F. PITCAIRN, OIF BRYN ATHYN, PENNSYLVANIA.

HELICOPTER DEVICE.

Applieetien mea Deeember 12, 1925. serialv No. 74,942.

This invention has for its primary object the .provision of an improved'aircraft'mechanism such as is commonly termed a helicopteryin'which. I may utilize a couple of 5 pairs of wings-or planes which are preferably of rigid and'cambered construction and pivotally attached to the Supporting member at or near the center of rotation and driven by means of a power device which is applied In machines of this general class certain difficulties are encountered, as, for example, differences in pressure and" thrust upon a wing moving forwardlyor in the general direction of the line of flight of the machine, as compared to a wing moving in the other direction, that is, in a to the line of flight.

One of the primary objects of my invention is the provision of a helicopter of the Referring more particularly to Fig. l'lit. will be seen that I have therein indicated a fuselage 1, with wheels 2 ofusual construction and a cockpit 3, with a couple of telescopically disposed revolving shafts 4 and 5 projecting upwardly. Each of the driving shafts 4 and 5 carries a hub member 6 to which the wings ,13 are attached by hinge joints 7 an elastic cord 14 being arranged, as shown, to carry the wings and prevent their drooping too low when not rotating.

Referring more particularly to Fig. 2 the 'lower hub member 6 is driven by means of a bevelled gear 8 while the upper one is driven general direction opposite by e. lbeveiligd.gear a'beeh'ef these beveued 'gears receiving their motion from the motor .The rear of the fuselage is provided-with rudder l1 and horizontally placed vanes l2 the latter serving the purpose of tilting the vertical shaft either" toward the position marked l5 or 16, the effect of tilting it toward l5 being to cause a progressive forward movement oft-he device, while the reverse movement tends to check the speed of the device, as in landing. 4

It will be observed that in the' rotative movement of the wings in my device, the parts will vary in position by virtue of the articulated connection With thehubsthroughout a distance indicated diagrammatically by the lines 17 .and 18 and thecentrifugal action will tend to retain the sustaining vanes or wmgs 1n operative shape and compensate for the difference in sustaining effect on the air due to the change in movement,l

that is Whether the rotative movement is toward the progressive movement of the device or opposite thereto.

To increase thel dynamic inertia of the Wings I may apply weights 13 at ornear the wing-tips, as shown in Fig. 1.

I claim l. A helicopter provided with an upright rotatinglshaft, a motor` constructed to drive said shaft, wings, of substantially uniform chord throughout their length, pivotally secured in position to be driven by said shaft, and vweights approximately at the wing tips to increase the dynamic inertia.

2. A helicopter provided with an upright l rotating shaft, a motor adapted to drive said shaft, wings pivotally secured in position to be driven by said shaft, said wings being of a chord at their inner as their chord at their outer ends, and Weights approximately at the wing tips to increase the dynamic inertia.

`In testimony whereof, I have hereunto signed my 'name Y HAROLD F. PITCAIRN.

ends atleast as great. 

